USBHost挂载U盘正常，只能读不能写。drv_pipe_xfer函数死循环

发布于 2022-06-15 17:49:34 浏览：1073 订阅该版

开发环境：RT-Thread stdio、源码4.1、使用的硬石YS-F4Pro开发板、芯片是stm32f407、U盘是USB2.0的。
问题：U盘可以正常挂载和枚举，文件系统挂载也正常，可以使用cat命令查看U盘内文件内容，但是echo命令写入失败（用命令与程序测试均尝试过），失败以后shell就是卡死无法输入。
请大家看下我的现象和分析，帮忙给点思路或者解决方法。

调试过程参考过论坛基本所有的提问，重点是如下2个帖子，这2个帖子里面提到的方法都尝试过，但无法解决问题：
[https://club.rt-thread.org/ask/article/dac2a83e018f6ad2.html](https://club.rt-thread.org/ask/article/dac2a83e018f6ad2.html)
[https://club.rt-thread.org/ask/article/0069975cbd0504f6.html](https://club.rt-thread.org/ask/article/0069975cbd0504f6.html)
调试过程：
正常mount U盘如下：
````c
 \ | /
- RT -     Thread Operating System
 / | \     4.1.0 build Jun 15 2022 16:43:48
 2006 - 2022 Copyright by RT-Thread team
[I/SFUD] Find a Boya BY25Q128AS flash chip. Size is 16777216 bytes.
[I/SFUD] W25Q128 flash device is initialize succusb connected
port 1 status 0x10201
ess.
[I/SFUD] Probe SPI flash W25Q128 by SPI device spi10 success.
[D/FAL] (fal_flash_init:49) Flash device |         onchip_flash_16k | addr: 0x08000000 | len: 0x00010000 | blk_size: 0x00004000 |initialized finish.
[D/FAL] (fal_flash_init:49) Flash device |         onchip_flash_64k | addr: 0x08010000 | len: 0x00010000 | blk_size: 0x00010000 |initialized finish.
[D/FAL] (fal_flash_init:49) Flash device |        onchip_flash_128k | addr: 0x08020000 | len: 0x000e0000 | blk_size: 0x00020000 |initialized finish.
[D/FAL] (fal_flash_init:49) Flash device |                  W25Q128 | addr: 0x00000000 | len: 0x01000000 | blk_size: 0x00001000 |initialized finish.
[I/FAL] ==================== FAL partition table ====================
[I/FAL] | name       | flash_dev         |   offset   |    length  |
[I/FAL] -------------------------------------------------------------
[I/FAL] | bootloader | onchip_flash_16k  | 0x00000000 | 0x00010000 |
[I/FAL] | param      | onchip_flash_64k  | 0x00000000 | 0x00010000 |
[I/FAL] | app        | onchip_flash_128k | 0x00000000 | 0x000e0000 |
[I/FAL] | easyflash  | W25Q128           | 0x00000000 | 0x00100000 |
[I/FAL] | download   | W25Q128           | 0x00100000 | 0x00100000 |
[I/FAL] =============================================================
[I/FAL] RT-Thread Flash Abstraction Layer initialize success.
[I/FAL] The FAL MTD NOR device (download) created successfully
[I/app.filesystem] mount to '/flash' success!
msh />reset port
start enumnation
ok
pipe transform remain size,: 8
ok
pipe transform remain size,: 0
ok
reset port
rt_usb_set_address
ok
pipe transform remain size,: 0
ok
get device descriptor length 18
ok
pipe transform remain size,: 18
ok
pipe transform remain size,: 0
ok
Vendor ID 0x951
Product ID 0x1665
ok
pipe transform remain size,: 18
ok
pipe transform remain size,: 0
ok
ok
pipe transform remain size,: 32
ok
pipe transform remain size,: 0
ok
ok
pipe transform remain size,: 0
ok
rt_usb_get_interface_descriptor: 0
interface class 0x8, subclass 0x6
rt_usb_get_endpoint_descriptor: 0
rt_usb_get_endpoint_descriptor: 1
subclass 6, protocal 80
rt_usbh_storage_run
rt_usb_get_endpoint_descriptor: 0
rt_usb_get_endpoint_descriptor: 1
rt_usbh_storage_reset
ok
pipe transform remain size,: 0
ok
rt_usbh_storage_get_max_lun
ok
pipe transform remain size,: 1
ok
pipe transform remain size,: 0
ok
rt_usbh_storage_inquiry
pipe transform remain size,: 31
nak
ok
pipe transform remain size,: 36
ok
pipe transform remain size,: 13
ok
rt_usbh_storage_test_unit_ready
pipe transform remain size,: 31
ok
pipe transform remain size,: 13
ok
rt_usbh_storage_get_capacity
pipe transform remain size,: 31
ok
pipe transform remain size,: 8
ok
pipe transform remain size,: 13
ok
capicity 15356160, block size 512
read partition table
rt_usbh_storage_read10
pipe transform remain size,: 31
ok
pipe transform remain size,: 512
ok
pipe transform remain size,: 448
ok
pipe transform remain size,: 384
ok
pipe transform remain size,: 320
ok
pipe transform remain size,: 256
ok
pipe transform remain size,: 192
ok
pipe transform remain size,: 128
ok
pipe transform remain size,: 64
ok
pipe transform remain size,: 13
ok
finished reading partition
rt_usbh_storage_read10
pipe transform remain size,: 31
ok
pipe transform remain size,: 512
ok
pipe transform remain size,: 448
ok
pipe transform remain size,: 384
ok
pipe transform remain size,: 320
ok
pipe transform remain size,: 256
ok
pipe transform remain size,: 192
ok
pipe transform remain size,: 128
ok
pipe transform remain size,: 64
ok
pipe transform remain size,: 13
ok
rt_usbh_storage_read10
pipe transform remain size,: 31
ok
pipe transform remain size,: 512
ok
pipe transform remain size,: 448
ok
pipe transform remain size,: 384
ok
pipe transform remain size,: 320
ok
pipe transform remain size,: 256
ok
pipe transform remain size,: 192
ok
pipe transform remain size,: 128
ok
pipe transform remain size,: 64
ok
pipe transform remain size,: 13
ok
Mount FAT on Udisk successful.
````
mount阶段有的时候偶尔会有nak，但是都可以挂载成功，没有影响，nak原因暂时未知。

正常读取1.txt文件如下：
```c
Mount FAT on Udisk successful.
ls
Directory /:
dev                 <DIR>
flash               <DIR>
udisk               <DIR>
msh />cd udisk
msh /udisk>ls
Directory /udisk:
rt_usbh_storage_read10
pipe transform remain size,: 31
ok
pipe transform remain size,: 512
ok
pipe transform remain size,: 448
ok
pipe transform remain size,: 384
ok
pipe transform remain size,: 320
ok
pipe transform remain size,: 256
ok
pipe transform remain size,: 192
ok
pipe transform remain size,: 128
ok
pipe transform remain size,: 64
ok
pipe transform remain size,: 13
ok
System Volume Inform<DIR>
1.txt               12
msh /udisk>cat 1.
msh /udisk>cat 1.txt
rt_usbh_storage_read10
pipe transform remain size,: 31
ok
pipe transform remain size,: 512
ok
pipe transform remain size,: 448
ok
pipe transform remain size,: 384
ok
pipe transform remain size,: 320
ok
pipe transform remain size,: 256
ok
pipe transform remain size,: 192
ok
pipe transform remain size,: 128
ok
pipe transform remain size,: 64
ok
pipe transform remain size,: 13
ok
123123123123
msh /udisk>
```

写入失败情况如下：
```c
msh /udisk>echo 2 2.txt
rt_usbh_storage_write10
pipe transform remain size,: 31
ok
pipe transform remain size,: 512
ok
pipe transform remain size,: 448
ok
pipe transform remain size,: 384
ok
pipe transform remain size,: 320
ok
pipe transform remain size,: 256
ok
pipe transform remain size,: 192
ok
pipe transform remain size,: 128

```
可以看到直接就卡死了，经过调试发现，此时在drv_pipe_xfer函数中死循环，循环时通过`HAL_HCD_HC_GetState(&stm32_hhcd_fs, pipe->pipe_index)`函数获取状态发现状态为URB_IDLE与HC_IDLE，进一步跟踪发现`HAL_HCD_HC_SubmitRequest`函数（具体代码如下）中将这2个状态设置为IDLE。
```c
hhcd->hc[ch_num].xfer_buff = pbuff;
  hhcd->hc[ch_num].xfer_len  = length;
  hhcd->hc[ch_num].urb_state = URB_IDLE;
  hhcd->hc[ch_num].xfer_count = 0U;
  hhcd->hc[ch_num].ch_num = ch_num;
  hhcd->hc[ch_num].state = HC_IDLE;
```
之后由于`rt_completion_wait(&urb_completion, timeout);`等不到完成量，完成量信号是在中断里面调用`HAL_HCD_HC_NotifyURBChange_Callback`发送出来的，但是一直没有中断发生，所以就以timeout（5S）时间一直循环，shell卡死应该就是没有对完成量的返回做处理。

手头没有USB协议分析仪，没办法分析协议，不知道到底是什么原因导致了这样的情况发送，请大神们给点思路，或者遇到相同情况的说说如何解决？